Standard Platinum Resistance Thermometer(BB 660/25.5)
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BB 660/25.5 is the Standard Platinum Resistance Thermometer jointly developed with National Institute of Advanced Industrial Science and Technology (AIST/NMIJ) as an interpolation device for measurements from -190℃ to approximately +660℃. Employing a sensing element with a single helix coil structure (Japan Pat. No.3380523) provides superior stability at high temperature and high resistance to vibration. It can also provide smaller self-heating temperature rise and high response.
| Sensing Element | Single helix coil wound in a quarts sensing frame at noninductive winding (L ≦ 40mm) |
| Sensing Element | Platinum (4-wires connection) |
| Quartz Sheath | φ7mm x approx.570mm length |
| Sensing Handle | φ19mm x approx.100mm, Aluminum outer casing |
| Lead Wires | 4 Teflon insulated copper wires jacketed with cross-linked polyethylene x 2.5m |
| Temperature Range | from -189.3442℃(Ar TP) to +660.323℃(Al FP) |
| Resistance Value | approx. 25.5Ω R0 |
| Resistance Ratio | WGA (29.7646℃)≧1.11807 |
| Reproducibility | within 1mK |
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